Soluble co-polymers of the fused selenophene monomer, DSG, with N-octylthienopyrrolodione are reported. Polymer solar cells fabricated from blends with PC71BM exhibit promising performance in inverted bulk heterojunction solar cells
The polymers based on thioester-substituted thieno[3,4-b]thiophene (TTS) exhibit a low band gap (∼1.5 eV) and desirable HOMO and LUMO energy levels relative to the fullerene acceptors.